Live Preview That Doesn't Lag

You type, it renders. No delay, no flicker. The preview updates as you write so you can see exactly how your document will look. I'm using the marked library under the hood — it's fast and handles all the standard markdown syntax without any issues.

You can also toggle the preview off if you prefer a distraction-free writing view. Just hit the eye icon and it's just you and the text.

Dark Mode — Because We All Code at 2 AM

The editor comes with a clean light theme and a dark theme that's actually easy on the eyes. I spent way too long tuning the dark mode colors. The background isn't pure black (that's #0f172a, a deep navy) and the text isn't blinding white. It works.

Your preference gets saved to localStorage so you don't have to switch it every time you open the editor.

Auto-Save (Thank Me Later)

Your work gets saved to localStorage every few seconds as you type. If you accidentally close the tab or your browser crashes, everything's still there when you come back. There's nothing worse than losing an hour of writing because you forgot to save.

The editor also remembers your last document when you return, so you can pick up right where you left off.

Mermaid Diagrams — For When Words Aren't Enough

Need to drop a flowchart, sequence diagram, or Gantt chart into your document? Just write the Mermaid syntax and it renders inline. This is one of those features that sounds niche but once you start using it, you wonder how you lived without it.

I use it for architecture docs and meeting notes all the time. Way faster than opening a separate diagram tool.

LaTeX Math Support

Write mathematical expressions using LaTeX notation and they render in real time. Inline math with $...$ and block math with $$...$$ both work. Powered by MathJax, so it handles everything from simple fractions to complex integrals.

Honestly, getting MathJax to play nice with the live preview without killing performance took some work. But it paid off — it's smooth.

Syntax Highlighting for Code Blocks

Code blocks get proper syntax highlighting with support for dozens of languages. Just specify the language after the opening triple backticks and highlight.js takes care of the rest. The dark theme uses the Atom One Dark color scheme which looks fantastic.

PWA — Works Offline

MDtoTEXT is a progressive web app. Open it once, and it works offline. No internet connection? No problem. Everything runs in your browser, including the auto-save and theme preferences. The service worker caches all the assets so you can keep writing on a plane, in a cafe with spotty WiFi, or anywhere else.

You can also install it as a standalone app on your phone or desktop. It behaves like a native app — no browser chrome, just the editor.

Search and Replace

You can search within your document and optionally replace text. It highlights all matches and lets you cycle through them. Basic stuff but it's there and it works.

Export Options

When you're done writing, you can copy the rendered HTML or export the raw markdown. No hidden formats, no conversion surprises. What you see is what you get.

Zero Tracking

There are no analytics scripts, no cookies, no user tracking, nothing. Everything stays in your browser. Your documents never touch a server. I built this as a privacy-first tool because I wanted a markdown editor that didn't phone home every five seconds.

If that matters to you too, give it a try.